I vote for toe clips. I used them through two kids, with an older-style front carrier, and never had a single incident. In fact I STILL use them, on my commuter and mountain bike, so I can ride in ordinary shoes when I want. Getting out of them is easy if you leave them slightly loose, and I don't go any slower than I do with clipless.
Secretly, I think clipless pedals are largely a triumph of marketing, but nearly everybody else in the world disagrees, so I suppose I COULD be wrong...